| OSOsram Sylvania Products INC. - Warren, Pa | Warren | PA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| PDPraxair Distribution, INC. | Bethlehem | PA | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| PCPressure Chem Co/pgh | Pittsburgh | PA | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| RCRoyal Chemical | East Stroudsburg | PA | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| TCTaylor Chemical, INC. | Taylor | PA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| TMTech Met INC | Donora | PA | Chemical Manufacturing325991 | — | ◇ UNVERIFIED |
| TSThe Sherwin-williams CO | Pittsburgh | PA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| TCTower Chemical Corporation | Easton | PA | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| VCValspar Coatings - Lebanon | Lebanon | PA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| VDVertellus Dwg LLC | Delaware Water Gap | PA | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
Acrymax Technologies INC. | Media | PA | Chemical Manufacturing325510 | — | ◐ LIKELY ACTIVE |
| BIBuckman's Inc. | Pottstown | PA | Chemical Manufacturing325180 | 100-499 | ◐ LIKELY ACTIVE |
| CPCustom Particle Solutions | Pipersville | PA | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
Encyclomedia INC | Philadelphia | PA | Chemical Manufacturing325199 | — | ◐ LIKELY ACTIVE |
Game Face Products, INC. | East Stroudsburg | PA | Chemical Manufacturing325620 | — | ◐ LIKELY ACTIVE |
| GLGenus Lifesciences INC | Allentown | PA | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| GIGrimm Industries, INC. | Fairview | PA | Chemical Manufacturing325211 | 100-499 | ◐ LIKELY ACTIVE |
Industrial Hydro Solutions LLC | Bernville | PA | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
Prochemtech International, INC | Brockway | PA | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
| APAxcentria Pharmaceuticals LLC | Telford | PA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| HMHarry Miller CORP | Philadelphia | PA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| MCMilazzo Company | Pittston | PA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| NTNational Towelette Conmpany | Bensalem | PA | Chemical Manufacturing325620 | — | ◇ UNVERIFIED |
| ALAir Liquide Advanced Materials - PA2 | Mount Bethel | PA | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| ALAir Liquide Amer Corp/donora | Donora | PA | Chemical Manufacturing325120 | — | ◐ LIKELY ACTIVE |
| APAir Products and Chemicals Inc.- Lancaster Facility | Lancaster | PA | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| ASAlloy Surfaces Aston Plt | Chester | PA | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
| ALAlmatis Leetsdale Fac | Leetsdale | PA | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| ACA&m Composting Fac | Manheim | PA | Chemical Manufacturing325311 | — | ◐ LIKELY ACTIVE |
| ACAmerican Colloid Company - York PA | York | PA | Chemical Manufacturing325998 | 20-99 | ◐ LIKELY ACTIVE |
| AFAndgrow Fertilizer Facility | East Berlin | PA | Chemical Manufacturing325314 | — | ◐ LIKELY ACTIVE |
| AIArkema Inc. Birdsboro Plant | Birdsboro | PA | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| ALArxada Llc/williamsport Plt | Williamsport | PA | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
| AIAstatech INC | Bristol | PA | Chemical Manufacturing325199 | — | ◐ LIKELY ACTIVE |
| ACAtofina Chem Inc/king of Prussia | King of Prussia | PA | Chemical Manufacturing325110 | — | ◐ LIKELY ACTIVE |
| BHBayer Healthcare | Myerstown | PA | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| CPCarbonlite P LLC | Reading | PA | Chemical Manufacturing325211 | — | ◐ LIKELY ACTIVE |
| CFCenter for Breakthrough Medicines - Building 29a | King of Prussia | PA | Chemical Manufacturing325414 | — | ◐ LIKELY ACTIVE |
| CCChongs Clnr (y&m)/levittown | Levittown | PA | Chemical Manufacturing325192 | — | ◐ LIKELY ACTIVE |
| CACollegeville Auto Body/collegeville | Collegeville | PA | Chemical Manufacturing325992 | — | ◐ LIKELY ACTIVE |
| CNColorcon No Tox | Chalfont | PA | Chemical Manufacturing325910 | 20-99 | ◐ LIKELY ACTIVE |
| CCCoopers Creek Chem Corp/conshohocken | Conshohocken | PA | Chemical Manufacturing325194 | — | ◐ LIKELY ACTIVE |
| CCCorixa CORP Dba Glaxo Smith Kline Vaccin | Marietta | PA | Chemical Manufacturing325414 | — | ◐ LIKELY ACTIVE |
| CLCrayola Llc/bethlehem Plt | Bethlehem | PA | Chemical Manufacturing325510 | — | ◐ LIKELY ACTIVE |
| CICroda INC Lamar Mfg | Mill Hall | PA | Chemical Manufacturing325411 | — | ◐ LIKELY ACTIVE |
| CMCustom Milling & Consulting | Fleetwood | PA | Chemical Manufacturing325991 | — | ◐ LIKELY ACTIVE |
| DMDupont Marshall Lab | Philadelphia | PA | Chemical Manufacturing325211 | — | ◐ LIKELY ACTIVE |
| DMDxtx Medical INC | Pittsburgh | PA | Chemical Manufacturing325411 | — | ◐ LIKELY ACTIVE |
| ELEarthcare Llc/bethel | Bethel | PA | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
| ESEcho Scientific | Pittsburgh | PA | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |